Accumulate and conserve energy. It seems that the energy challenge of the future is all in this sentence.
We can all potentially be energy producers, but how can we use excess energy without going through the power company?
Car batteries could be the ideal hub to solve the problem.

https://www.ilsole24ore.com/art/casa/2019-02-11/sara-l-automobile-elettrica-ricaricare-casa-132703.shtml?